Needle grinder for fine die drilling machines



March 25, .1947- F. CROSSMAN EI'AL 2,417,810

NEEDLE GRINDER FOR FINE DIE DRILLING IACHINES Filed Jan. 51, 1944 2sheets sheet 1 5M", w x5 WW5 W4 r 1m h Qn ,nuz m H 1 m March 25, 1947. goss u AL 2,417,810

NEEDLE GRIKDER FOR FINE DIE DRILLING MACHINES Filed Jan. 31., 1944 2Sheets-Sheet 2 Patented Mar.'25, 1947 NEEDLE GRINDER FOR FINE DIEDRILLING- MACHINES Fred Crossman and Earl A. Southam, Cleveland,

Ohio, assignors to Lindsay Wire Weaving Company, Cleveland, Ohio, acorporation of Ohio Application January 31, 1944, Serial No. 520,446

In the drilling of relatively small holes in diamonds or other materialto form dies such as are used in the processing of wire, itis importantto grind or hone the drilling point frequently.

The primary object of the present invention is to provide an effectivehoning device mounted on the frame of such fine die drilling machine andout of the region of drilling action but movable for action wheneverdesired to dress the point of the drill without requiring its removalfrom the drill spindle.

A further object is to enable the ready adjustment of the angle of thehone with reference to the drill axis and to limit the approach ofthehone to such axis, so that the drill may be properly dressed.

Another object is to enable the ready manual manipulation of thepositioned hone transversely of the drill point as the same is rotated.

The above outlined objects and the means for accomplishing the same willbe more apparent from the following detailed description of apreferredembodiment of the invention illustrated in the drawings.

In the drawings, Fig 1 is a front elevation'o f a fine die drillingmachine equipped with our honing device: Fig. 2 is a plan of themachine; Fig. 3 is a sectional side elevation on a larger scale of awork holder and a diamond supported thereby for drilling; Figs. 4 and 5are views similar to Figs. 1 and 2, respectively, but illustrating thehoning device detached ,from the drilling apparatus, the scale beinglargerthan that of Figs. 1 and 2; Fig. 6 is a view on the same scale asFigs. 3 and '4 looking at the right hand side of the honing device;Figs. '7 and 8 are cross sections, as indicated by the correspondinglynumbered lines on Fig. 6.

To set out a proper background for our invention, we will first describebriefly the drilling machine shown in Figs. 1 and 2. We have there showna suitable frame having a horizontaltop plate l0 and two horizontallower plates l l. Rotatably carried by these lower plates is a verticalspindle 12 carrying a table 13 which carries a suitable work fixing forthe die, such fixture being indicated at A in Fig. 3.

Mounted on the top frame plate Hi we have shown a housing 20 in which isjournaled a vertically movable spindle 2|. We have indicated at 22 apinion splined on this spindle and meshing with an idler gear 25 whichmeshes with a driving gear 26 on a spindle 21, shown as driven by a belt28. 29 indicates the drill, held suitably chucked in the spindle andthus constantly rowardly and gravity downwardly.

6 Claims. 101.125-30) tated by the belt 28. The table i3 is rotated inthe opposite direction to the drill and at a slower speed, as by asuitable driving belt, indicated at It.

A suitable form of work holder A. adapted to be mounted on the table i3,is illustrated in Fig. 3, and is shown as carrying a diamond a to bedrilled.

' The drill spindle with its drill is reciprocated during its rotationby mechanism indicated in Fig. 1. Thus, we have shown a collar 30 on thedrill spindle resting on a lever 3| which has a bosson its undersideresting on a crown cam l2 mounted on the hub 01 a gear 33 which mesheswith an elongated driving pinion 35 on an arbor 36. This arbor isconnected by a driving belt 38 to the shaft 21 heretofore mentioned.

It results from the mechanism indicated that the rotating shaft 21rotates the cam 32 and this reciprocates the spindle,'the lever movingit up- The downward movement of the drillmay be controlled by a suitablemicrometer adjustment. 1

As shown, this movement is' limited by thehub I of the gear 33 abuttinga vertically slidable pin 40 mounted in a frame plate 4|. The lower endof this pin is carried by a bar 42 in whichis journaled the lowerend ofa micrometer screw 43 which may thus move the pin up and down and set itto give the desired approach of the die to the work.

The honing device of the present invention, when utilized for such adrill and spindle as above described, has a supporting bracketadjust-ably mounted on the top frame plate 10. This bracket rests on acylindrical fulcrum 5|, which may readily be a short piece of tube, andis locked in position bybolts 52 and 53 mounted in the top frame plateH) of the machine and carrying nuts 54 and 55. By loosening one nut andtightening the other the bracket is rocked in one direction or the otherand held firmly in position.

The bracket 50 has a portion 56 at an oblique angle to the drillspindle, and mounted in the portion is a rod 60 extending through ablock 6| which is thus swiveled to the bracket. As shown the rod extendsthrough the bracket and has a head at its upper end, while below theblock it has a suitable stop, as. for instance. a washer B3 engaging theunderside of the block and the pin 64 positioning the washer. The blockis thus held snugly against the underside of the bracket and is swiveledthereto.

The block 6| has a shallow groove formed in one face thereof in which isslidably mounted a fiat bar which forms the bone holder. This bar isheld in place by a plate 66 secured to the block. Mounted on the honeholder 10 is a clip 1| secured-to the holder by a screw 12, the clipand=bar being adapted to have the hone 80 clamped between them. the honethus projecting yforwardly from the holder.

The supporting bracket 50 has a downwardly projecting ear 58, in whichis mounted a set screw59bearing against anear 69 on the block 6|. Thiscar and the set screw it abuts, being on the opposite side of the pivotfrom the hone 89,,form an adjustable stop limiting the movement of thehone toward the drill. The adjustment of the bracket 50 controls theangle of the hone tothe drill and thus these two adjustmerits enable thehone to be presented-to the drill with the desired limit of approach andat 1 drill, the carrier and hone are simply swung into the positionindicated in full lines in Fi s. land v .4 and hone'i then manuallymanipulated back and forth bv sliding its carrier in the positionedblock 6| as the drill is rotated. This enables the ready dressing of thedrill in a very accurate manner without-requiring its removal from themachine. a

It will be seen that the hone may be removed from the carrier whenever"desired by merely loosening the clamping screw. 1 This enablesthe honeto be dressed from time to time so that it will present an absolute truesurface to the drill.

The dev ce of the-present invention contributes greatly to the accuracyof the drilling operation over the old method of'removing' the,

drill and honing it by hand. In precision operations to ten thousandthsof an inch, or even thousandths, it is very desirable not to disturb thedrillin its spindle, or the spindle in theme.- chine, as a replacementof the parts may bring theminto slightly different position. Moreover,

hand honing of the removed drill is very likely to cause greatertreatment on'ene portion of the drill point than on the other.Accordingly, by holding the drill with a hone at a definite angle and adefinite limited approach to theaxis, we are'ableto do the necessaryhoning with an accuracy far greater than formerly. v

In addition to the accuracy of honing provided by our device, there isthe great advantage of savingin the time required for the removal of thedrill and its subsequent honing. Moreover by having the honing deviceready at hand for instant operation the operator will naturally hone thedrill with greater frequency than heretofore and thus maintain itsharper, than if it was necessary to remove it each time, resulting inthe drilling of a more accurate hole in the die.

We claim:

- l. The combination with a upport of a bracket mounted on a fulcrum ofthe support, a pair of threaded members engaging the bracket on oppositesides of the fulcrum to position the bracket. :a block pivoted to thebracket, a bar slidably i mounted inthe block. and a hone mounted on thebar.

2.'The combination with a s'upportI a bracket mounted on a fulcrum onthe support, threaded members engaging the bracket on opposite sides Iof the fulcrum whereby the bracket may be machine, a rotary rocked, ablock swlveled to the bracket, a bar slidably mounted on the blockextending transvcrsely of the block. a hone, and a clamp for holding thehone to the bar.

3; The combination with aframe of a drilling spindle carried thereby andcarrying a drill, a work holder opposite the drill, a bracket adjustablysecured to the frame of the machine and having a portion'projecting atan oblique angle to the axis of the drill, a block swiveled to suchoblique portion of the bracket,

"a slide mounted in the block extending transversely thereof, means forclamping a hone on the slide with the face of the hone at an obliqueangle to the axis of the drill, means for swinging the bracket on theframe to change the angle of the hone to the drill, and means forlimiting the swinging of the block on the bracket to limit thepresentation of the bone tothe drill.

i 4. In a fine the drilling machine. the combination of a frame, arotary spindle carried thereby,

a needle drill carried by the spindle, a grinding device mounted on theframe'of the machine, the mounting comprising an adjustable bracketcarrying a guideway lying parallel to a tangent to the drill and areciprocable slide in said guideway carrying a hone having its face inengagement with the drill'dur'ing the reciprocation of the slide, andmeans for adjusting the guideway with reference to the bracket to limitthe approach of said hone to the drill. 5. The combination of a worktable, a spindle normal thereto adapted tocarry a drill in axialalignment with the spindle, a hone, a slidable carrier thereforshiftable bodily into and. out of the region'between the table andspindle and reciprocable in said regionin a path substantially tangentto the periphery of the drill, and means for tipping the carrier tochange the angle of presentation of the hone to the drill.

6. The combination of a frame carrying a rotary drill, a bracket mountedon the frame, a

' block pivotally connectedto the bracket, a bone holder' lidablymounted in the block and adapted to be swung to and from active positionand reciprocated when in active position with the hone in engagementwith the drill, means for adjusting the position of the bracket tochange the angle of the hone to the drill, and means for adjustablylimiting the position of the block on the bracket.

FRED CROSSMAN.

EARL A. SOUTHAM.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number

